Leaks, data breaches, and ransom notes: The worst hacks of 2026 so far

The first half of 2026 has seen several significant security incidents and data breaches, including the massive DOGE data breach, compromise of critical infrastructure, and hack of federal surveillance systems. The DOGE data breach was particularly notable, although details of it are scarce. The other breaches and hacks have had various impacts on their respective targets, with some still ongoing.